Restrict mtree to specific directories

[Martin Husemann <martin%duskware.de@localhost>]

I have a small issue with mtree(8), that I am not quite sure how to fix
best.

I would like to create directory hierachies from mtree spec files, but
restrict this to selected hierachies (where the mtree files contain a
bit more).

Example:

	mkdir /tmp/test && cd /tmp/test && mtree -f /etc/mtree/special -dqUW

Now I get this in /tmp/test:

drwxr-xr-x   3 root  wheel   48 Jun  2 16:04 dev
drwxr-xr-x  13 root  wheel  528 Jun  2 16:04 etc
drwxr-xr-x   2 root  wheel    0 Jun  2 16:04 root
drwxr-xr-x   2 root  wheel    0 Jun  2 16:04 sbin
drwxr-xr-x   9 root  wheel  336 Jun  2 16:04 usr
drwxr-xr-x  14 root  wheel  576 Jun  2 16:04 var

What if I want to restrict the created subdirectories to /tmp/test/var ?

Should be easy, there are -O onlypaths and -X exclude-file options to mtree.
The files are supposed to contain lines of fnmatch(3) patters, which are
evaluated with FNM_PATHNAME option against the to-be-created file/dir.

So in above example I could create a "onlyfile" containing something like:

	./var
	./var/*
	./var/*/*
	./var/*/*/*
	./var/*/*/*/*
	./var/*/*/*/*/*

or so I thought - but (a) it does not work and (b) I don't know how deep some
future mtree spec file will be below var.

Am I missing some easy trick? Anything obvious I did wrong (so it does not
work but should if I do it right)?

I am considering to add a variant of -O that specifies directory prefixes
and skips all files outside of one of the specified dirs, so my invocation
above would become:

	mkdir /tmp/test && cd /tmp/test && \
	     mtree -f /etc/mtree/special -dqUW -D ./var

Martin